Screw-cutting die.



No. 803,445. PATENTED OUT. 81, 1905. A. J. SMART & R. S. BASGOM.

SCREW CUTTING DIE.

APPLIGATION FILED NOV. 21, 1904.

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ALBERT J. SMART AND ROLLIN S. BASCOM, OF GREENFIELD, MASSA- CHUSETTS, ASSIGNORS TO THE WILEY & RUSSELL MANUFACTUR- ING COMPANY, OF GREENFIELD, MASSACHUSETTS, A CORPORA- TION OF MASSACHUSETTS.

SCREW-CUTTING DIE.

Specification of Letters Patent.

Patented Oct. 31, 1905.

Application filed November 21, 1904. Serial No. 233,635-

' to make and use the same.

This invention relates to screw-threading dies, more particularly to what are known as divided dies, which allow of adjustment to compensate for wear or to cut screw-threads of different depth and sizes by means of a single die; and the objects of the present invention are to improve on the manner of adjusting the separate die parts, whereby the danger and inconvenience attendant upon dropping out the adjusting means are avoided.

Further objects of the invention are to provide suitable means to hold the parts from opening too far and to provide means other than the connecting means to give firmness to the position of the parts.

To the accomplishment of these objects and such others as may hereinafter appear the invention comprises the novel construction and combinations of parts hereinafter described, and particularly pointed out in the appended claims, reference being had to the accompanying drawings, which, although the essential and characteristic features of the invention are susceptible of modification, show the preferred embodiment thereof.

Corresponding and like parts are referred to in the following description and indicated in all the views of the drawings by the same reference characters.

Figure 1 shows aplan view of the die parts assembled together and partially broken away to disclose the adjusting means. Fig. 2 shows an elevational view of Fig. 1 looking from right to left, and Fig. 3 shows an interior elevational view of Fig. 1 with the upper die part of that View removed.

Referring to the drawings, a and I) represent parts of a divided die formed of any suitable metal, provided, as usual, on their inner faces with threads 0, forming the screw-threading means. In the preferable form of the die a pivotal connection is provided between one pair of meeting faces and means for adjusting the die parts about said pivotal connection at the other pair of meeting faces.

It will be noted that the pivotal connection and adjusting means are both constructed so as to lie substantially entirely Within the material forming the die, thus doing away with the necessity of a guide or collet, as heretoforegenerally in use, which is both expensive and burdensome and of no practical value in properly forming the threads.

The novel pivotal connection shown has been fully described and its advantages particularly pointed out in a copending application of Albert J. Smart, dated April 13, 1904. and serially numbered 203,002, and need not be described here further than to say that it consists, essentially, of a double-headed screw d, having, preferably, one head in the form of a nut e and one or both of said heads being cupshaped and engaging with recesses f, formed in lugs g on the die parts.

The particular point of novelty herein resides in the construction of the means for adjusting the die parts, (shown most clearly in Fig. 1,) and the particular feature of this style or class of adjusting means resides in the fact that the die parts are forced apart by a pressure directly upon oneof the meetingfaces by means of a longitudinally-movable member located in the opposing face. By the expression longitudinally movable is meanta movement of the adjusting member in a direction to and from the meeting face in which it is seated a. 6., a line of travel substantially at right angles to said face. The especial form of this class of adjusting means which is preferably used consists of a member 7L, seated in one of the meeting faces of the die parts, as face c', which is constructed so that it may be given a longitudinal movement, as by threading it into the die. The end of member h project ing from the meeting face abuts against the opposing face and forces the die apart when the amount of projection is lengthened. It is obvious that the screw 7L may be readily manipulated from between the die parts; but in order to provide a more convenient means for manipulatingthis member a recess in is formed in the periphery of the die, so as to give access to the non-abutting end of said screw.

It is readily understood that when the end of screw lz/has merely a frictional contact with face 7' on shortening the amount of projection the part (6 is notdrawn toward part band the die has to be closed by haml-pressure or other external means; To remedy this.diliiculty, the preferred embodimentof the invention is provided with a slot t, extending, preferably, radially in the face j,which slot is provided with a contracted opening, as shown by Fig. 2, and the screw /t is provided with a rounded head 121, here shown in the form of a ball, which fits within said slot and with it acts in the nature of a ball-andsocl et joint upon any movement of the die parts. Under this construction when the screwfi of the drawing is given a lefthand rotation the head m is held in the slot by means of its contracted opening and the parts a and 7) are drawn together. \Vhen the screw it is given a right-hand rotation, the ball 7/2, abutting against the back of slot Z in face 7', forces the die apart.

The die may be assembled in two ways: first, by hinging the parts together, then slipping the rounded end of the screw into the slot, and then drawing said screw into its seat tl'irough the meeting face, or, second, by inserting the screw in'its seat through either opening, then inserting the rounded end in the slot, and then hinging the parts together.

It is readily seen that owing to the ability of the adjusting means to keep the die parts from falling apart when taken from the diestoclr the particular form of hinged connection here illustrated may be done away with entirely, and the improved adjustable connection shown may be placed between each pair of meeting ends of thedie parts, in which case either connection may be adjusted, using the other as a hinge, or both maybe adjusted simultaneously.

The invention is not to be understood as being limited to the details of construction and arrangement of parts as herein described and illustrated, as it is manifest that numerous variations and modifications may be made in the features of construction and arrangement in the adaptatioi'i of the device to various conditions of use without departing from its scope and spirit. The right is therefore reserved to all such variations and modifications as properly fall within the scopeof the invention and the terms of the following claims.

\Ve claim-- 1. A divided die for cutting screw-threads composed of suitably-assembled cutting members, a pivotal connection between one pair of meeting faces, a distance-piece seated and held in one of another pair of meeting faces to project therefrom and abut against the opposing face, and adjustable means whereby the amount of such projection may be varied to adjust the parts, substantially as described.

2. A divided die for cutting screw-threads composed of suitablyassembled cutting members, a pivotal connection between one pair of meeting faces, a longitudinally-movable member projecting from and held in one of another pair of meeting faces and abutting against the opposing face, means thereon for engaging the die, and means on the die cooperating with said engaging means for holding said member in any desired position to adjust the parts, substantially as described.

3. A divided die for cutting screw-threads composed of suitably-assembled cutting members, a pivotal connection between one pair of meeting faces, and adjusting means comprising a screw seated in one of another pair of meeting faces to project therefrom and abut against the opposing face, substantially as described.

4. A divided die for cutting screw-threads composed of suitably-assembled cutting members, a pivotal connection between one pair of meeting faces, adjusting means comprising a screw seated in one of another pair of meeting faces to project therefrom and abut against the opposing faces, and means for enabling said screw to be manipulated from the nonabutting end, substantially as described.

5. The combination with a divided die for cutting screw-threads having an undercut slot in one of the meeting faces, of a distance piece having one end adjustably seated in the opposite meeting face and its other end constructed to lit within and be held in engagement with said slot, and means for varying the length of the distance-piece between said faces to adjust the parts, substantially as clescribed.

6. The combination with a divided die for cutting screw-threads having an undercut slot in one of the meeting faces, of a longitudinally-movable member having one end seated in the opposite meeting face. means on said end for engaging the die, and means on the die cooperating with said engaging means for holding said member in any desired position, the other end of said member constructed to [it within and be held in engagement with said slot, substantially as described.

7. The combination with a divided die for cutting screw-threads having an undercut slot of circular section in one of the meeting faces, of a screw-threaded distance-piece having one end screwed in the opposite meeting face and its other end terminating in a ball adapted to fit within said slot, and means for varying the length of the distance-piece between said faces to adjust the parts, substantially as described.

8. The combination with a divided die for cutting screw-threads having an undercut slot in one of the meeting faces, of adjusting means comprising a screw having one end threaded in the opposite meeting face and its end of said screw constructed to fit within IO other end constructed to fit Within and be held said slot, substantially as described. in engagement with said slot, substantially as In testimony whereof we aflix our signatures described. in presence of two witnesses.

9. A divided die for cutting screw-threads ALBERT J. SMART. having an undercut slot in one of the meeting ROLLIN S. BASCOM. faces, adjusting means comprising a screw Witnesses: passed from the periphery of the die through FRANCIS M. THOMPSON,

the opposite meeting face, and a ball on one I ELLEN K. OKEEFE. 

